The right-click menu in the QGraphicsView cannot select immovable items

The QGraphicsItem:: mousePressEvent function will ignore the event if the item is not movable. In the QGraphicsScenePrivate:: mousePressEventHandler, all ignore event items will be deleted, causing the selection status of multiple selected items to be cleared, and the right-click menu cannot select non movable items.
 
else if (!(flags() & ItemIsMovable))

 
The scene will clear the selected status of all immovable items